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Waterfowl Production on the Woodworth Station
in South-central North Dakota, 1965-1981

Table 13. Regression coefficients for duck pairs from wetland size,
Woodworth Study Area, 1965-75.

Table 13. Regression coefficients for duck pairs from wetland size, Woodworth Study Area, 1965-75.
  Regression coefficients  
Species and wetland class area
b1		 area
b2		 Overall significance level
Mallard
Temporary 0.22* -0.05 0.0001
Seasonal 0.04* 0.10* 0.0001
Semipermanent -0.01 0.23* 0.0001
Gadwall
Temporary 0.05 0.04 0.08
Seasonal 0.10* 0.08* 0.0001
Semipermanent 0.06 0.18 0.0001
Northern pintail
Temporary 0.35* -0.06 0.0003
Seasonal 0.06* 0.03* 0.0001
Semipermanent -0.00 0.10* 0.0001
Green-winged teal
Temporary 0.18* -0.06* 0.0001
Seasonal 0.02* 0.00 0.0001
Semipermanent -0.01* 0.05* 0.0001
Blue-winged teal
Temporary 0.42 0.10 0.0001
Seasonal 0.20* 0.53* 0.0001
Semipermanent -0.13* 1.29* 0.0001
American wigeon
Temporary 0.01 0.01 0.18
Seasonal 0.01* 0.02* 0.0001
Semipermanent -0.01* 0.05* 0.0004
Redhead
Temporary 0.00 0.00 --a
Seasonal 0.03* -0.02* 0.0001
Semipermanent -0.00 0.16* 0.0001
Canvasback
Temporary 0.00 0.00 --
Seasonal 0.003* -0.00 0.0001
Semipermanent 0.01 0.05 0.0017
Lesser scaup
Temporary 0.05* -0.01 0.0039
Seasonal 0.06* -0.06* 0.0001
Semipermanent 0.02* 0.01 0.0001
Ruddy duck
Temporary 0.00 0.00 --
Seasonal 0.05* -0.04* 0.0001
Semipermanent 0.08* -0.06 0.0001
Dabbling ducks
Temporary 1.32* -0.03 0.0001
Seasonal 0.44* 0.80* 0.0001
Semipermanent -0.06 1.87* 0.0001
Diving ducks
Temporary 0.05* -0.01 0.0039
Seasonal 0.15* -0.13* 0.0001
Semipermanent 0.11* 0.16 0.0001
aIndicates no data
*Indicates significant coefficients at the P < 0.05 level.
Notes: pair counts are average values for 1965-75 and pairs = b1 area + b2 area where area is in acres.

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